The Potential of Seawater in Geopolymer Mixtures – Effect of Alkaline Activator, Seawater, and Steam Curing on the Strength of Geopolymer Paste

• Autorzy: Perdanawati Rizqi Abdi , Risdanareni Puput , Setiamarga Davin H.E. , Ekaputri Januarti Jaya , Kusbiantoro Andri , Liao Min-Chih

Identyfikatory

DOI

10.12911/22998993/192526

• Języki publikacji: EN

Abstrakty

EN

The use of seawater in cement-based concrete is debateable because it may increase the hydration rate but significantly decreases the durability. Alternately, seawater can be used as an alkaline activator solution in geopolymer however, very little is currently known about its effects. This study investigated the effect of seawater as alkaline activator mix solution and curing media on the compressive strength of geopolymer paste. The mixtures varied based on the molarity of alkaline activator solution. Alkaline activators were prepared with two solutions: diluted water and seawater. A day after casting, steam curing method was conducted at 65 _°C for 2 hours and then immersed in seawater or normal water for 28 days. This study revealed that seawater in alkaline activator reduced the compressive strength by up to 25%. Applying temperature resulted the early age strength nearly comparable to the later age strength. Immersion the paste in seawater increased the strength up to 15%. The X-Ray diffraction analysis shown the presence of chloride on the surface, consequently preserving the compressive strength without any reduction at 28 days of immersion. The Scanning Electron Microscopy analysis inside the geopolymer paste prepared with seawater shown the microstructure of quartz, mullite, hematite, and the presence of chloride spread around resulting the disruption of polymerization. The results indicated that seawater has the potential as an alkaline activator mix solution and curing media, compensated by requirement of higher molarity of NaOH.

Słowa kluczowe

EN

geopolymer; fly ash; seawater; compressive strength

• Wydawca: Polskie Towarzystwo Inżynierii Ekologicznej ; Lublin University of Technology
• Czasopismo: Journal of Ecological Engineering
• Rocznik: 2024
• Tom: Vol. 25, nr 10
• Strony: 370--380
• Opis fizyczny: Bibliograf. 38., rys., tab.

Twórcy

autor

Perdanawati Rizqi Abdi

• Sepuluh Nopember Institute of Technology (ITS), Department of Civil Engineering, Sukolilo, Surabaya, Indonesia

• https://orcid.org/0009-0007-0327-3185

autor

Risdanareni Puput

• Department of Civil Engineering and Planning, Faculty of Engineering, State University of Malang, Semarang Street 5, Malang, Indonesia

• https://orcid.org/0000-0001-5190-1771

autor

Setiamarga Davin H.E.

• National Institute of Technology (KOSEN), Department of Applied Chemistry and Biochemistry, Wakayama College, Wakayama, Japan

• https://orcid.org/0000-0002-3854-4893

autor

Ekaputri Januarti Jaya

• Sepuluh Nopember Institute of Technology (ITS), Department of Civil Engineering, Sukolilo, Surabaya, Indonesia

• https://orcid.org/0000-0002-9547-8132

autor

Kusbiantoro Andri

• Faculty of Engineering Technology, Universiti Tun Hussein Onn, Johor, Malaysia

• https://orcid.org/0000-0002-5910-4838

autor

Liao Min-Chih

• Civil and Construction Engineering, the National Taiwan University of Science and Technology (NTUST), Taipei City, Taiwan

• https://orcid.org/0000-0002-0395-0744

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